Fastener



FIG. 1 is a front perspective view of the new design for a fastener;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left view thereof; and,

FIG. 7 is a right view thereof.

The stippling is used to indicate the surface of the material from which the fastening device is made, and is not intended to indicate surface decoration. 

We claim the ornamental design for a fastener, as shown and described. 